Using Hba And Hs Alarms; Hba And Hs Alarm Operations - Omron E5CN User Manual

Using HBA and HS Alarms

3-10 Using HBA and HS Alarms

3-10-1 HBA and HS Alarm Operations

Heating control output status
Control output Operation indicator
(heating)
ON Lit
OFF Not lit
Note
54
• Heater burnout detection is executed by measuring heater current while
the control output for heating is ON, and HS detection is executed by
measuring heater current while it is OFF. For details, refer to the following
table.
(Heater burnout detection and HS detection cannot be used with the con-
trol output for cooling.)
Power to heater
Yes (Normal) (See note 1.)
No (Heater burnout)
Yes (HS alarm)
No (Normal) (See note 2.)
ON
Control output (heating)
OFF
(1) In the above diagram, power is considered to be ON (normal) if the heater
current is greater than the heater burnout detection current during the Ton
interval. If the heater is burned out, the measured current decreases and
falls below the heater burnout detection value. The output is then activat-
ed as the heater burnout alarm.
(2) In the above diagram, power is considered to be OFF (normal) if the leak-
age current is less than the HS alarm current during the Toff interval. If
the SSR output is short-circuited, the measured current increases be-
yond the HS alarm value. The output is then activated as the HS alarm.
(3) Heater burnouts are not detected if the control output (heating) ON time
(Ton) is 190 ms or less.
(4) HS are not detected if the control output (heating) OFF time (Toff) is
190 ms or less.
• For models with HBA and HS alarms, an OR output is established
between the ALM 1 function and the HBA/HS alarm. If the ALM1 function
is to be used for HBA and HS alarms only, set 0 as the ALM1 type and do
not use ALM1.
• Turn the heater power ON simultaneously or before turning ON the E5@N
power. If the heater power is turned ON after turning ON the E5AN power,
the HBA will be activated.
• Control is continued even when the HBA or HS alarm is active.
• The rated current value may sometimes differ slightly from the actual cur-
rent flowing to the heater.
Use the "heater current 1 value monitor," "heater current 2 value monitor,"
"leakage current 1 monitor," and "leakage current 2 monitor" parameters
to check the actual current being used.
HBA output
OFF
ON
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Ton*3 Toff*4
Section 3-10
HS alarm output
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ON
OFF